What was found
FLT 705 - MSP - AFTER DEPARTURE A/C REQUIRED 20-25 DEGREES LEFT AILERON TO MAINTAIN LEVEL FLIGHT, RETURNED TO MSP. FOUND LEFT MAIN FUEL TANK WITH 6600 LBS OF FUEL, RT MAIN TANK 9500 LBS, DRAINED LEFT TANK AND FUELED TO KNOWN QTY 9500 LBS OR 1359 GALS, AIL CHECKS OK, OK TO CONTINUE. SUBMITTER STATES, SUSPECT FUEL WAS UNBALANCED AT DEPARTURE MSP. (M)